高熔体强度聚丙烯的发泡性能研究  

RESEARCH ON THE FOAMING PROPERTIES OF THE HIGH-MELT-STRENGTH POLYPROPYLENE

作　　者：杨淑静[1] 宋国君[1] 佘希林[1] 谷正[1] 杨超[1] 

机构地区：[1]青岛大学高分子材料研究所,青岛266071

出　　处：《工程塑料应用》2007年第12期33-38,共6页Engineering Plastics Application

摘　　要：通过反应挤出法对聚丙烯（PP）进行硅烷接枝交联改性获得高熔体强度PP（HMSPP），并对HMSPP的发泡性能及影响因素进行了研究。结果表明，HMSPP具有良好的发泡性能，可以制备出高质量泡沫材料；随着HMSPP的熔体流动速率的降低，泡沫材料的密度和泡孔平均直径降低；随着HMSPP用量减少，HMSPP／PP泡沫材料的泡孔平均直径和密度增大，泡孔尺寸及分布的不均匀程度增加；发泡条件对泡沫结构具有一定的影响，最佳的发泡温度为185～190℃，螺杆转速为40～100r／min；随着口模厚度的增加，泡孔平均直径增加，材料密度下降，而材料内外层泡孔直径不均匀性增加.High-melt-strength polypropylene （HMSPP） was prepared by silane-grafting and cross-linking of polypropylene （PP） through reactive extrusion, and the HMSPP foam was fabricated by extrusion. The foaming properties and its influencing factors were investigated. The results showed that the HMSPP had excellent foaming properties, and high-quality foam could be fabricated with the HMSPP. The foam density and the average cell size deceased as the MFR of the HMSPP decreasing. With the decreasing of the content of HMSPP, the foam density and the average cell size increased, and the asymmetrical degree of the cell size and the cell distribution increased. Foaming art conditions affected the PP foam construction to some degree,and the optimal temperature and rotate speed of the screw were 185 - 190℃ and 40 - 100 r/min. With the increasing of the jaws thickness, the average cell size increased, and the foam density reduced, while the asymmetrical degree of the cell sizes between the inner and the outer of the plate increased.

关 键 词：硅烷接枝交联 反应挤出 高熔体强度聚丙烯 发泡性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]